BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
SEA→BWI

Seattle, WA (SEA) to Baltimore, MD (BWI) flight delay odds

79.7% of 719 official scheduled SEA-to-BWI flights arrived on time; 9.3% arrived at least 30 minutes late and 0.4% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
79.7%arrived on time
9.3%30+ min late
0.4%cancelled
719scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.5%all scheduled flights
120+ minutes late0.8%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival-1.1 mincompleted flights

Which departure time was most reliable for SEA to BWI?

Among qualifying SEA-to-BWI departure window results, Late morning had the highest on-time rate: 81.4% of 365 flights. Night was lowest at 78.0% across 354 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning36581.4%8.5%0.5%
Night35478.0%10.2%0.3%

Which weekday was most reliable for SEA to BWI?

Among qualifying SEA-to-BWI weekday results, Saturday had the highest on-time rate: 86.2% of 94 flights. Sunday was lowest at 71.7% across 106 flights.

DayFlightsOn time30+ minCancelled
Monday10676.4%11.3%0.0%
Tuesday10283.3%6.9%0.0%
Wednesday10280.4%11.8%0.0%
Thursday10577.1%12.4%1.0%
Friday10483.7%6.7%0.0%
Saturday9486.2%3.2%0.0%
Sunday10671.7%12.3%1.9%

Which airline was most reliable for SEA to BWI?

Among qualifying SEA-to-BWI airline results, Alaska Airlines had the highest on-time rate: 82.0% of 599 flights. Southwest Airlines was lowest at 68.3% across 120 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines59982.0%7.7%0.5%
Southwest Airlines12068.3%17.5%0.0%

Which month was most reliable for SEA to BWI?

Among qualifying SEA-to-BWI month results, April 2026 had the highest on-time rate: 94.7% of 38 flights. August 2025 was lowest at 66.7% across 93 flights.

MonthFlightsOn time30+ minCancelled
July 20259267.4%17.4%0.0%
August 20259366.7%15.1%0.0%
September 20259081.1%5.6%0.0%
October 20255691.1%0.0%1.8%
November 20255088.0%6.0%0.0%
December 20256083.3%8.3%0.0%
January 20263677.8%8.3%5.6%
February 20262889.3%3.6%0.0%
March 20263183.9%9.7%0.0%
April 20263894.7%2.6%0.0%
May 20265882.8%6.9%0.0%
June 20268778.2%13.8%0.0%

What drove SEA to BWI delay minutes?

Airline was the largest recorded SEA-to-BWI delay category, accounting for 42.5% of 5,927 BTS-attributed delay minutes during July 2025–June 2026.

Airline42.5%
Late aircraft33.7%
National airspace20.1%
Weather3.6%
Security0.2%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.